A simple way to make a Collagraph plate is to cut shapes out of thin cardboard such as a file folder and glue them, with a glue stick, onto another piece of cardboard. You can coat your finished plate with matte acrylic medium if you want to protect it. I did not do that. The little dots and windows were made with globs of glue allowed to dry.
You then ink up or acrylic up your plate using a Brayer to apply the paint. I dampened my paper first. You have to be fast if you use acrylics as they dry fast. I used Rives Lightweight printmaking paper, because I had some. Place paper moist side down on top of plate. Use your palm to press the paint onto the paper. Remove paper and voila.
This is the first plate I made. I used corregated cardboard for the plate and ended up with lines in the final print that I didn't intend.
This was super fun. I followed the instructions in my new book: Printmaking & Mixed Media by Dorit Elisha.
Tools. Here is a piece of mat board for the plate, a cut out moon from a file folder and the glue stick before assemblage. Oops, should have shown the brayer too.